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mirror_zfs/module/zfs/dsl_bookmark.c
Paul Dagnelie ca5777793e Reduce loaded range tree memory usage 
This patch implements a new tree structure for ZFS, and uses it to 
store range trees more efficiently.

The new structure is approximately a B-tree, though there are some 
small differences from the usual characterizations. The tree has core 
nodes and leaf nodes; each contain data elements, which the elements 
in the core nodes acting as separators between its children. The 
difference between core and leaf nodes is that the core nodes have an 
array of children, while leaf nodes don't. Every node in the tree may 
be only partially full; in most cases, they are all at least 50% full 
(in terms of element count) except for the root node, which can be 
less full. Underfull nodes will steal from their neighbors or merge to 
remain full enough, while overfull nodes will split in two. The data 
elements are contained in tree-controlled buffers; they are copied 
into these on insertion, and overwritten on deletion. This means that 
the elements are not independently allocated, which reduces overhead, 
but also means they can't be shared between trees (and also that 
pointers to them are only valid until a side-effectful tree operation 
occurs). The overhead varies based on how dense the tree is, but is 
usually on the order of about 50% of the element size; the per-node 
overheads are very small, and so don't make a significant difference. 
The trees can accept arbitrary records; they accept a size and a 
comparator to allow them to be used for a variety of purposes.

The new trees replace the AVL trees used in the range trees today. 
Currently, the range_seg_t structure contains three 8 byte integers 
of payload and two 24 byte avl_tree_node_ts to handle its storage in 
both an offset-sorted tree and a size-sorted tree (total size: 64 
bytes). In the new model, the range seg structures are usually two 4 
byte integers, but a separate one needs to exist for the size-sorted 
and offset-sorted tree. Between the raw size, the 50% overhead, and 
the double storage, the new btrees are expected to use 8*1.5*2 = 24 
bytes per record, or 33.3% as much memory as the AVL trees (this is 
for the purposes of storing metaslab range trees; for other purposes, 
like scrubs, they use ~50% as much memory).

We reduced the size of the payload in the range segments by teaching 
range trees about starting offsets and shifts; since metaslabs have a 
fixed starting offset, and they all operate in terms of disk sectors, 
we can store the ranges using 4-byte integers as long as the size of 
the metaslab divided by the sector size is less than 2^32. For 512-byte
sectors, this is a 2^41 (or 2TB) metaslab, which with the default
settings corresponds to a 256PB disk. 4k sector disks can handle 
metaslabs up to 2^46 bytes, or 2^63 byte disks. Since we do not 
anticipate disks of this size in the near future, there should be 
almost no cases where metaslabs need 64-byte integers to store their 
ranges. We do still have the capability to store 64-byte integer ranges 
to account for cases where we are storing per-vdev (or per-dnode) trees, 
which could reasonably go above the limits discussed. We also do not 
store fill information in the compact version of the node, since it 
is only used for sorted scrub.

We also optimized the metaslab loading process in various other ways
to offset some inefficiencies in the btree model. While individual
operations (find, insert, remove_from) are faster for the btree than 
they are for the avl tree, remove usually requires a find operation, 
while in the AVL tree model the element itself suffices. Some clever 
changes actually caused an overall speedup in metaslab loading; we use 
approximately 40% less cpu to load metaslabs in our tests on Illumos.

Another memory and performance optimization was achieved by changing 
what is stored in the size-sorted trees. When a disk is heavily 
fragmented, the df algorithm used by default in ZFS will almost always 
find a number of small regions in its initial cursor-based search; it 
will usually only fall back to the size-sorted tree to find larger 
regions. If we increase the size of the cursor-based search slightly, 
and don't store segments that are smaller than a tunable size floor 
in the size-sorted tree, we can further cut memory usage down to 
below 20% of what the AVL trees store. This also results in further 
reductions in CPU time spent loading metaslabs.

The 16KiB size floor was chosen because it results in substantial memory 
usage reduction while not usually resulting in situations where we can't 
find an appropriate chunk with the cursor and are forced to use an 
oversized chunk from the size-sorted tree. In addition, even if we do 
have to use an oversized chunk from the size-sorted tree, the chunk 
would be too small to use for ZIL allocations, so it isn't as big of a 
loss as it might otherwise be. And often, more small allocations will 
follow the initial one, and the cursor search will now find the 
remainder of the chunk we didn't use all of and use it for subsequent 
allocations. Practical testing has shown little or no change in 
fragmentation as a result of this change.

If the size-sorted tree becomes empty while the offset sorted one still 
has entries, it will load all the entries from the offset sorted tree 
and disregard the size floor until it is unloaded again. This operation 
occurs rarely with the default setting, only on incredibly thoroughly 
fragmented pools.

There are some other small changes to zdb to teach it to handle btrees, 
but nothing major.
                                           
Reviewed-by: George Wilson <gwilson@delphix.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed by: Sebastien Roy seb@delphix.com
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #9181
2019-10-09 10:36:03 -07:00

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/*
* CDDL HEADER START
*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2013, 2018 by Delphix. All rights reserved.
* Copyright 2017 Nexenta Systems, Inc.
*/
#include <sys/zfs_context.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_synctask.h>
#include <sys/dsl_destroy.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/arc.h>
#include <sys/zap.h>
#include <sys/zfeature.h>
#include <sys/spa.h>
#include <sys/dsl_bookmark.h>
#include <zfs_namecheck.h>
#include <sys/dmu_send.h>
static int
dsl_bookmark_hold_ds(dsl_pool_t *dp, const char *fullname,
dsl_dataset_t **dsp, void *tag, char **shortnamep)
{
char buf[ZFS_MAX_DATASET_NAME_LEN];
char *hashp;
if (strlen(fullname) >= ZFS_MAX_DATASET_NAME_LEN)
return (SET_ERROR(ENAMETOOLONG));
hashp = strchr(fullname, '#');
if (hashp == NULL)
return (SET_ERROR(EINVAL));
*shortnamep = hashp + 1;
if (zfs_component_namecheck(*shortnamep, NULL, NULL))
return (SET_ERROR(EINVAL));
(void) strlcpy(buf, fullname, hashp - fullname + 1);
return (dsl_dataset_hold(dp, buf, tag, dsp));
}
/*
* Returns ESRCH if bookmark is not found.
* Note, we need to use the ZAP rather than the AVL to look up bookmarks
* by name, because only the ZAP honors the casesensitivity setting.
*/
int
dsl_bookmark_lookup_impl(dsl_dataset_t *ds, const char *shortname,
zfs_bookmark_phys_t *bmark_phys)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks_obj;
matchtype_t mt = 0;
int err;
if (bmark_zapobj == 0)
return (SET_ERROR(ESRCH));
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
/*
* Zero out the bookmark in case the one stored on disk
* is in an older, shorter format.
*/
bzero(bmark_phys, sizeof (*bmark_phys));
err = zap_lookup_norm(mos, bmark_zapobj, shortname, sizeof (uint64_t),
sizeof (*bmark_phys) / sizeof (uint64_t), bmark_phys, mt, NULL, 0,
NULL);
return (err == ENOENT ? ESRCH : err);
}
/*
* If later_ds is non-NULL, this will return EXDEV if the specified bookmark
* does not represents an earlier point in later_ds's timeline. However,
* bmp will still be filled in if we return EXDEV.
*
* Returns ENOENT if the dataset containing the bookmark does not exist.
* Returns ESRCH if the dataset exists but the bookmark was not found in it.
*/
int
dsl_bookmark_lookup(dsl_pool_t *dp, const char *fullname,
dsl_dataset_t *later_ds, zfs_bookmark_phys_t *bmp)
{
char *shortname;
dsl_dataset_t *ds;
int error;
error = dsl_bookmark_hold_ds(dp, fullname, &ds, FTAG, &shortname);
if (error != 0)
return (error);
error = dsl_bookmark_lookup_impl(ds, shortname, bmp);
if (error == 0 && later_ds != NULL) {
if (!dsl_dataset_is_before(later_ds, ds, bmp->zbm_creation_txg))
error = SET_ERROR(EXDEV);
}
dsl_dataset_rele(ds, FTAG);
return (error);
}
typedef struct dsl_bookmark_create_redacted_arg {
const char *dbcra_bmark;
const char *dbcra_snap;
redaction_list_t **dbcra_rl;
uint64_t dbcra_numsnaps;
uint64_t *dbcra_snaps;
void *dbcra_tag;
} dsl_bookmark_create_redacted_arg_t;
typedef struct dsl_bookmark_create_arg {
nvlist_t *dbca_bmarks;
nvlist_t *dbca_errors;
} dsl_bookmark_create_arg_t;
static int
dsl_bookmark_create_check_impl(dsl_dataset_t *snapds, const char *bookmark_name,
dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *bmark_fs;
char *shortname;
int error;
zfs_bookmark_phys_t bmark_phys = { 0 };
if (!snapds->ds_is_snapshot)
return (SET_ERROR(EINVAL));
error = dsl_bookmark_hold_ds(dp, bookmark_name,
&bmark_fs, FTAG, &shortname);
if (error != 0)
return (error);
if (!dsl_dataset_is_before(bmark_fs, snapds, 0)) {
dsl_dataset_rele(bmark_fs, FTAG);
return (SET_ERROR(EINVAL));
}
error = dsl_bookmark_lookup_impl(bmark_fs, shortname,
&bmark_phys);
dsl_dataset_rele(bmark_fs, FTAG);
if (error == 0)
return (SET_ERROR(EEXIST));
if (error == ESRCH)
return (0);
return (error);
}
static int
dsl_bookmark_create_check(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_arg_t *dbca = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
int rv = 0;
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS))
return (SET_ERROR(ENOTSUP));
for (nvpair_t *pair = nvlist_next_nvpair(dbca->dbca_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbca->dbca_bmarks, pair)) {
dsl_dataset_t *snapds;
int error;
/* note: validity of nvlist checked by ioctl layer */
error = dsl_dataset_hold(dp, fnvpair_value_string(pair),
FTAG, &snapds);
if (error == 0) {
error = dsl_bookmark_create_check_impl(snapds,
nvpair_name(pair), tx);
dsl_dataset_rele(snapds, FTAG);
}
if (error != 0) {
fnvlist_add_int32(dbca->dbca_errors,
nvpair_name(pair), error);
rv = error;
}
}
return (rv);
}
static dsl_bookmark_node_t *
dsl_bookmark_node_alloc(char *shortname)
{
dsl_bookmark_node_t *dbn = kmem_alloc(sizeof (*dbn), KM_SLEEP);
dbn->dbn_name = spa_strdup(shortname);
dbn->dbn_dirty = B_FALSE;
mutex_init(&dbn->dbn_lock, NULL, MUTEX_DEFAULT, NULL);
return (dbn);
}
/*
* Set the fields in the zfs_bookmark_phys_t based on the specified snapshot.
*/
static void
dsl_bookmark_set_phys(zfs_bookmark_phys_t *zbm, dsl_dataset_t *snap)
{
spa_t *spa = dsl_dataset_get_spa(snap);
objset_t *mos = spa_get_dsl(spa)->dp_meta_objset;
dsl_dataset_phys_t *dsp = dsl_dataset_phys(snap);
zbm->zbm_guid = dsp->ds_guid;
zbm->zbm_creation_txg = dsp->ds_creation_txg;
zbm->zbm_creation_time = dsp->ds_creation_time;
zbm->zbm_redaction_obj = 0;
/*
* If the dataset is encrypted create a larger bookmark to
* accommodate the IVset guid. The IVset guid was added
* after the encryption feature to prevent a problem with
* raw sends. If we encounter an encrypted dataset without
* an IVset guid we fall back to a normal bookmark.
*/
if (snap->ds_dir->dd_crypto_obj != 0 &&
spa_feature_is_enabled(spa, SPA_FEATURE_BOOKMARK_V2)) {
(void) zap_lookup(mos, snap->ds_object,
DS_FIELD_IVSET_GUID, sizeof (uint64_t), 1,
&zbm->zbm_ivset_guid);
}
if (spa_feature_is_enabled(spa, SPA_FEATURE_BOOKMARK_WRITTEN)) {
zbm->zbm_flags = ZBM_FLAG_SNAPSHOT_EXISTS | ZBM_FLAG_HAS_FBN;
zbm->zbm_referenced_bytes_refd = dsp->ds_referenced_bytes;
zbm->zbm_compressed_bytes_refd = dsp->ds_compressed_bytes;
zbm->zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes;
dsl_dataset_t *nextds;
VERIFY0(dsl_dataset_hold_obj(snap->ds_dir->dd_pool,
dsp->ds_next_snap_obj, FTAG, &nextds));
dsl_deadlist_space(&nextds->ds_deadlist,
&zbm->zbm_referenced_freed_before_next_snap,
&zbm->zbm_compressed_freed_before_next_snap,
&zbm->zbm_uncompressed_freed_before_next_snap);
dsl_dataset_rele(nextds, FTAG);
} else {
bzero(&zbm->zbm_flags,
sizeof (zfs_bookmark_phys_t) -
offsetof(zfs_bookmark_phys_t, zbm_flags));
}
}
void
dsl_bookmark_node_add(dsl_dataset_t *hds, dsl_bookmark_node_t *dbn,
dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
if (hds->ds_bookmarks_obj == 0) {
hds->ds_bookmarks_obj = zap_create_norm(mos,
U8_TEXTPREP_TOUPPER, DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0,
tx);
spa_feature_incr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
dsl_dataset_zapify(hds, tx);
VERIFY0(zap_add(mos, hds->ds_object,
DS_FIELD_BOOKMARK_NAMES,
sizeof (hds->ds_bookmarks_obj), 1,
&hds->ds_bookmarks_obj, tx));
}
avl_add(&hds->ds_bookmarks, dbn);
/*
* To maintain backwards compatibility with software that doesn't
* understand SPA_FEATURE_BOOKMARK_V2, we need to use the smallest
* possible bookmark size.
*/
uint64_t bookmark_phys_size = BOOKMARK_PHYS_SIZE_V1;
if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2) &&
(dbn->dbn_phys.zbm_ivset_guid != 0 || dbn->dbn_phys.zbm_flags &
ZBM_FLAG_HAS_FBN || dbn->dbn_phys.zbm_redaction_obj != 0)) {
bookmark_phys_size = BOOKMARK_PHYS_SIZE_V2;
spa_feature_incr(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2, tx);
}
__attribute__((unused)) zfs_bookmark_phys_t zero_phys = { 0 };
ASSERT0(bcmp(((char *)&dbn->dbn_phys) + bookmark_phys_size,
&zero_phys, sizeof (zfs_bookmark_phys_t) - bookmark_phys_size));
VERIFY0(zap_add(mos, hds->ds_bookmarks_obj, dbn->dbn_name,
sizeof (uint64_t), bookmark_phys_size / sizeof (uint64_t),
&dbn->dbn_phys, tx));
}
/*
* If redaction_list is non-null, we create a redacted bookmark and redaction
* list, and store the object number of the redaction list in redact_obj.
*/
static void
dsl_bookmark_create_sync_impl(const char *bookmark, const char *snapshot,
dmu_tx_t *tx, uint64_t num_redact_snaps, uint64_t *redact_snaps, void *tag,
redaction_list_t **redaction_list)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
dsl_dataset_t *snapds, *bmark_fs;
char *shortname;
boolean_t bookmark_redacted;
uint64_t *dsredactsnaps;
uint64_t dsnumsnaps;
VERIFY0(dsl_dataset_hold(dp, snapshot, FTAG, &snapds));
VERIFY0(dsl_bookmark_hold_ds(dp, bookmark, &bmark_fs, FTAG,
&shortname));
dsl_bookmark_node_t *dbn = dsl_bookmark_node_alloc(shortname);
dsl_bookmark_set_phys(&dbn->dbn_phys, snapds);
bookmark_redacted = dsl_dataset_get_uint64_array_feature(snapds,
SPA_FEATURE_REDACTED_DATASETS, &dsnumsnaps, &dsredactsnaps);
if (redaction_list != NULL || bookmark_redacted) {
redaction_list_t *local_rl;
if (bookmark_redacted) {
redact_snaps = dsredactsnaps;
num_redact_snaps = dsnumsnaps;
}
dbn->dbn_phys.zbm_redaction_obj = dmu_object_alloc(mos,
DMU_OTN_UINT64_METADATA, SPA_OLD_MAXBLOCKSIZE,
DMU_OTN_UINT64_METADATA, sizeof (redaction_list_phys_t) +
num_redact_snaps * sizeof (uint64_t), tx);
spa_feature_incr(dp->dp_spa,
SPA_FEATURE_REDACTION_BOOKMARKS, tx);
VERIFY0(dsl_redaction_list_hold_obj(dp,
dbn->dbn_phys.zbm_redaction_obj, tag, &local_rl));
dsl_redaction_list_long_hold(dp, local_rl, tag);
ASSERT3U((local_rl)->rl_dbuf->db_size, >=,
sizeof (redaction_list_phys_t) + num_redact_snaps *
sizeof (uint64_t));
dmu_buf_will_dirty(local_rl->rl_dbuf, tx);
bcopy(redact_snaps, local_rl->rl_phys->rlp_snaps,
sizeof (uint64_t) * num_redact_snaps);
local_rl->rl_phys->rlp_num_snaps = num_redact_snaps;
if (bookmark_redacted) {
ASSERT3P(redaction_list, ==, NULL);
local_rl->rl_phys->rlp_last_blkid = UINT64_MAX;
local_rl->rl_phys->rlp_last_object = UINT64_MAX;
dsl_redaction_list_long_rele(local_rl, tag);
dsl_redaction_list_rele(local_rl, tag);
} else {
*redaction_list = local_rl;
}
}
if (dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) {
spa_feature_incr(dp->dp_spa,
SPA_FEATURE_BOOKMARK_WRITTEN, tx);
}
dsl_bookmark_node_add(bmark_fs, dbn, tx);
spa_history_log_internal_ds(bmark_fs, "bookmark", tx,
"name=%s creation_txg=%llu target_snap=%llu redact_obj=%llu",
shortname, (longlong_t)dbn->dbn_phys.zbm_creation_txg,
(longlong_t)snapds->ds_object,
(longlong_t)dbn->dbn_phys.zbm_redaction_obj);
dsl_dataset_rele(bmark_fs, FTAG);
dsl_dataset_rele(snapds, FTAG);
}
static void
dsl_bookmark_create_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_arg_t *dbca = arg;
ASSERT(spa_feature_is_enabled(dmu_tx_pool(tx)->dp_spa,
SPA_FEATURE_BOOKMARKS));
for (nvpair_t *pair = nvlist_next_nvpair(dbca->dbca_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbca->dbca_bmarks, pair)) {
dsl_bookmark_create_sync_impl(nvpair_name(pair),
fnvpair_value_string(pair), tx, 0, NULL, NULL, NULL);
}
}
/*
* The bookmarks must all be in the same pool.
*/
int
dsl_bookmark_create(nvlist_t *bmarks, nvlist_t *errors)
{
nvpair_t *pair;
dsl_bookmark_create_arg_t dbca;
pair = nvlist_next_nvpair(bmarks, NULL);
if (pair == NULL)
return (0);
dbca.dbca_bmarks = bmarks;
dbca.dbca_errors = errors;
return (dsl_sync_task(nvpair_name(pair), dsl_bookmark_create_check,
dsl_bookmark_create_sync, &dbca,
fnvlist_num_pairs(bmarks), ZFS_SPACE_CHECK_NORMAL));
}
static int
dsl_bookmark_create_redacted_check(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_redacted_arg_t *dbcra = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *snapds;
int rv = 0;
if (!spa_feature_is_enabled(dp->dp_spa,
SPA_FEATURE_REDACTION_BOOKMARKS))
return (SET_ERROR(ENOTSUP));
/*
* If the list of redact snaps will not fit in the bonus buffer with
* the furthest reached object and offset, fail.
*/
if (dbcra->dbcra_numsnaps > (dmu_bonus_max() -
sizeof (redaction_list_phys_t)) / sizeof (uint64_t))
return (SET_ERROR(E2BIG));
rv = dsl_dataset_hold(dp, dbcra->dbcra_snap,
FTAG, &snapds);
if (rv == 0) {
rv = dsl_bookmark_create_check_impl(snapds, dbcra->dbcra_bmark,
tx);
dsl_dataset_rele(snapds, FTAG);
}
return (rv);
}
static void
dsl_bookmark_create_redacted_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_create_redacted_arg_t *dbcra = arg;
dsl_bookmark_create_sync_impl(dbcra->dbcra_bmark, dbcra->dbcra_snap, tx,
dbcra->dbcra_numsnaps, dbcra->dbcra_snaps, dbcra->dbcra_tag,
dbcra->dbcra_rl);
}
int
dsl_bookmark_create_redacted(const char *bookmark, const char *snapshot,
uint64_t numsnaps, uint64_t *snapguids, void *tag, redaction_list_t **rl)
{
dsl_bookmark_create_redacted_arg_t dbcra;
dbcra.dbcra_bmark = bookmark;
dbcra.dbcra_snap = snapshot;
dbcra.dbcra_rl = rl;
dbcra.dbcra_numsnaps = numsnaps;
dbcra.dbcra_snaps = snapguids;
dbcra.dbcra_tag = tag;
return (dsl_sync_task(bookmark, dsl_bookmark_create_redacted_check,
dsl_bookmark_create_redacted_sync, &dbcra, 5,
ZFS_SPACE_CHECK_NORMAL));
}
/*
* Retrieve the list of properties given in the 'props' nvlist for a bookmark.
* If 'props' is NULL, retrieves all properties.
*/
static void
dsl_bookmark_fetch_props(dsl_pool_t *dp, zfs_bookmark_phys_t *bmark_phys,
nvlist_t *props, nvlist_t *out_props)
{
ASSERT3P(dp, !=, NULL);
ASSERT3P(bmark_phys, !=, NULL);
ASSERT3P(out_props, !=, NULL);
ASSERT(RRW_LOCK_HELD(&dp->dp_config_rwlock));
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_GUID))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_GUID, bmark_phys->zbm_guid);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_CREATETXG))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_CREATETXG, bmark_phys->zbm_creation_txg);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_CREATION))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_CREATION, bmark_phys->zbm_creation_time);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_IVSET_GUID))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_IVSET_GUID, bmark_phys->zbm_ivset_guid);
}
if (bmark_phys->zbm_flags & ZBM_FLAG_HAS_FBN) {
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_REFERENCED))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_REFERENCED,
bmark_phys->zbm_referenced_bytes_refd);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_LOGICALREFERENCED))) {
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_LOGICALREFERENCED,
bmark_phys->zbm_uncompressed_bytes_refd);
}
if (props == NULL || nvlist_exists(props,
zfs_prop_to_name(ZFS_PROP_REFRATIO))) {
uint64_t ratio =
bmark_phys->zbm_compressed_bytes_refd == 0 ? 100 :
bmark_phys->zbm_uncompressed_bytes_refd * 100 /
bmark_phys->zbm_compressed_bytes_refd;
dsl_prop_nvlist_add_uint64(out_props,
ZFS_PROP_REFRATIO, ratio);
}
}
if ((props == NULL || nvlist_exists(props, "redact_snaps") ||
nvlist_exists(props, "redact_complete")) &&
bmark_phys->zbm_redaction_obj != 0) {
redaction_list_t *rl;
int err = dsl_redaction_list_hold_obj(dp,
bmark_phys->zbm_redaction_obj, FTAG, &rl);
if (err == 0) {
if (nvlist_exists(props, "redact_snaps")) {
nvlist_t *nvl;
nvl = fnvlist_alloc();
fnvlist_add_uint64_array(nvl, ZPROP_VALUE,
rl->rl_phys->rlp_snaps,
rl->rl_phys->rlp_num_snaps);
fnvlist_add_nvlist(out_props, "redact_snaps",
nvl);
nvlist_free(nvl);
}
if (nvlist_exists(props, "redact_complete")) {
nvlist_t *nvl;
nvl = fnvlist_alloc();
fnvlist_add_boolean_value(nvl, ZPROP_VALUE,
rl->rl_phys->rlp_last_blkid == UINT64_MAX &&
rl->rl_phys->rlp_last_object == UINT64_MAX);
fnvlist_add_nvlist(out_props, "redact_complete",
nvl);
nvlist_free(nvl);
}
dsl_redaction_list_rele(rl, FTAG);
}
}
}
int
dsl_get_bookmarks_impl(dsl_dataset_t *ds, nvlist_t *props, nvlist_t *outnvl)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
ASSERT(dsl_pool_config_held(dp));
if (dsl_dataset_is_snapshot(ds))
return (SET_ERROR(EINVAL));
for (dsl_bookmark_node_t *dbn = avl_first(&ds->ds_bookmarks);
dbn != NULL; dbn = AVL_NEXT(&ds->ds_bookmarks, dbn)) {
nvlist_t *out_props = fnvlist_alloc();
dsl_bookmark_fetch_props(dp, &dbn->dbn_phys, props, out_props);
fnvlist_add_nvlist(outnvl, dbn->dbn_name, out_props);
fnvlist_free(out_props);
}
return (0);
}
/*
* Comparison func for ds_bookmarks AVL tree. We sort the bookmarks by
* their TXG, then by their FBN-ness. The "FBN-ness" component ensures
* that all bookmarks at the same TXG that HAS_FBN are adjacent, which
* dsl_bookmark_destroy_sync_impl() depends on. Note that there may be
* multiple bookmarks at the same TXG (with the same FBN-ness). In this
* case we differentiate them by an arbitrary metric (in this case,
* their names).
*/
static int
dsl_bookmark_compare(const void *l, const void *r)
{
const dsl_bookmark_node_t *ldbn = l;
const dsl_bookmark_node_t *rdbn = r;
int64_t cmp = TREE_CMP(ldbn->dbn_phys.zbm_creation_txg,
rdbn->dbn_phys.zbm_creation_txg);
if (likely(cmp))
return (cmp);
cmp = TREE_CMP((ldbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN),
(rdbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN));
if (likely(cmp))
return (cmp);
cmp = strcmp(ldbn->dbn_name, rdbn->dbn_name);
return (TREE_ISIGN(cmp));
}
/*
* Cache this (head) dataset's bookmarks in the ds_bookmarks AVL tree.
*/
int
dsl_bookmark_init_ds(dsl_dataset_t *ds)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
ASSERT(!ds->ds_is_snapshot);
avl_create(&ds->ds_bookmarks, dsl_bookmark_compare,
sizeof (dsl_bookmark_node_t),
offsetof(dsl_bookmark_node_t, dbn_node));
if (!dsl_dataset_is_zapified(ds))
return (0);
int zaperr = zap_lookup(mos, ds->ds_object, DS_FIELD_BOOKMARK_NAMES,
sizeof (ds->ds_bookmarks_obj), 1, &ds->ds_bookmarks_obj);
if (zaperr == ENOENT)
return (0);
if (zaperr != 0)
return (zaperr);
if (ds->ds_bookmarks_obj == 0)
return (0);
int err = 0;
zap_cursor_t zc;
zap_attribute_t attr;
for (zap_cursor_init(&zc, mos, ds->ds_bookmarks_obj);
(err = zap_cursor_retrieve(&zc, &attr)) == 0;
zap_cursor_advance(&zc)) {
dsl_bookmark_node_t *dbn =
dsl_bookmark_node_alloc(attr.za_name);
err = dsl_bookmark_lookup_impl(ds,
dbn->dbn_name, &dbn->dbn_phys);
ASSERT3U(err, !=, ENOENT);
if (err != 0) {
kmem_free(dbn, sizeof (*dbn));
break;
}
avl_add(&ds->ds_bookmarks, dbn);
}
zap_cursor_fini(&zc);
if (err == ENOENT)
err = 0;
return (err);
}
void
dsl_bookmark_fini_ds(dsl_dataset_t *ds)
{
void *cookie = NULL;
dsl_bookmark_node_t *dbn;
if (ds->ds_is_snapshot)
return;
while ((dbn = avl_destroy_nodes(&ds->ds_bookmarks, &cookie)) != NULL) {
spa_strfree(dbn->dbn_name);
mutex_destroy(&dbn->dbn_lock);
kmem_free(dbn, sizeof (*dbn));
}
avl_destroy(&ds->ds_bookmarks);
}
/*
* Retrieve the bookmarks that exist in the specified dataset, and the
* requested properties of each bookmark.
*
* The "props" nvlist specifies which properties are requested.
* See lzc_get_bookmarks() for the list of valid properties.
*/
int
dsl_get_bookmarks(const char *dsname, nvlist_t *props, nvlist_t *outnvl)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
int err;
err = dsl_pool_hold(dsname, FTAG, &dp);
if (err != 0)
return (err);
err = dsl_dataset_hold(dp, dsname, FTAG, &ds);
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
err = dsl_get_bookmarks_impl(ds, props, outnvl);
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (err);
}
/*
* Retrieve all properties for a single bookmark in the given dataset.
*/
int
dsl_get_bookmark_props(const char *dsname, const char *bmname, nvlist_t *props)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
zfs_bookmark_phys_t bmark_phys = { 0 };
int err;
err = dsl_pool_hold(dsname, FTAG, &dp);
if (err != 0)
return (err);
err = dsl_dataset_hold(dp, dsname, FTAG, &ds);
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
err = dsl_bookmark_lookup_impl(ds, bmname, &bmark_phys);
if (err != 0)
goto out;
dsl_bookmark_fetch_props(dp, &bmark_phys, NULL, props);
out:
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (err);
}
typedef struct dsl_bookmark_destroy_arg {
nvlist_t *dbda_bmarks;
nvlist_t *dbda_success;
nvlist_t *dbda_errors;
} dsl_bookmark_destroy_arg_t;
static void
dsl_bookmark_destroy_sync_impl(dsl_dataset_t *ds, const char *name,
dmu_tx_t *tx)
{
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
uint64_t bmark_zapobj = ds->ds_bookmarks_obj;
matchtype_t mt = 0;
uint64_t int_size, num_ints;
/*
* 'search' must be zeroed so that dbn_flags (which is used in
* dsl_bookmark_compare()) will be zeroed even if the on-disk
* (in ZAP) bookmark is shorter than offsetof(dbn_flags).
*/
dsl_bookmark_node_t search = { 0 };
char realname[ZFS_MAX_DATASET_NAME_LEN];
/*
* Find the real name of this bookmark, which may be different
* from the given name if the dataset is case-insensitive. Then
* use the real name to find the node in the ds_bookmarks AVL tree.
*/
if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
mt = MT_NORMALIZE;
VERIFY0(zap_length(mos, bmark_zapobj, name, &int_size, &num_ints));
ASSERT3U(int_size, ==, sizeof (uint64_t));
if (num_ints * int_size > BOOKMARK_PHYS_SIZE_V1) {
spa_feature_decr(dmu_objset_spa(mos),
SPA_FEATURE_BOOKMARK_V2, tx);
}
VERIFY0(zap_lookup_norm(mos, bmark_zapobj, name, sizeof (uint64_t),
num_ints, &search.dbn_phys, mt, realname, sizeof (realname), NULL));
search.dbn_name = realname;
dsl_bookmark_node_t *dbn = avl_find(&ds->ds_bookmarks, &search, NULL);
ASSERT(dbn != NULL);
if (dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) {
/*
* If this bookmark HAS_FBN, and it is before the most
* recent snapshot, then its TXG is a key in the head's
* deadlist (and all clones' heads' deadlists). If this is
* the last thing keeping the key (i.e. there are no more
* bookmarks with HAS_FBN at this TXG, and there is no
* snapshot at this TXG), then remove the key.
*
* Note that this algorithm depends on ds_bookmarks being
* sorted such that all bookmarks at the same TXG with
* HAS_FBN are adjacent (with no non-HAS_FBN bookmarks
* at the same TXG in between them). If this were not
* the case, we would need to examine *all* bookmarks
* at this TXG, rather than just the adjacent ones.
*/
dsl_bookmark_node_t *dbn_prev =
AVL_PREV(&ds->ds_bookmarks, dbn);
dsl_bookmark_node_t *dbn_next =
AVL_NEXT(&ds->ds_bookmarks, dbn);
boolean_t more_bookmarks_at_this_txg =
(dbn_prev != NULL && dbn_prev->dbn_phys.zbm_creation_txg ==
dbn->dbn_phys.zbm_creation_txg &&
(dbn_prev->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)) ||
(dbn_next != NULL && dbn_next->dbn_phys.zbm_creation_txg ==
dbn->dbn_phys.zbm_creation_txg &&
(dbn_next->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN));
if (!(dbn->dbn_phys.zbm_flags & ZBM_FLAG_SNAPSHOT_EXISTS) &&
!more_bookmarks_at_this_txg &&
dbn->dbn_phys.zbm_creation_txg <
dsl_dataset_phys(ds)->ds_prev_snap_txg) {
dsl_dir_remove_clones_key(ds->ds_dir,
dbn->dbn_phys.zbm_creation_txg, tx);
dsl_deadlist_remove_key(&ds->ds_deadlist,
dbn->dbn_phys.zbm_creation_txg, tx);
}
spa_feature_decr(dmu_objset_spa(mos),
SPA_FEATURE_BOOKMARK_WRITTEN, tx);
}
if (dbn->dbn_phys.zbm_redaction_obj != 0) {
VERIFY0(dmu_object_free(mos,
dbn->dbn_phys.zbm_redaction_obj, tx));
spa_feature_decr(dmu_objset_spa(mos),
SPA_FEATURE_REDACTION_BOOKMARKS, tx);
}
avl_remove(&ds->ds_bookmarks, dbn);
spa_strfree(dbn->dbn_name);
mutex_destroy(&dbn->dbn_lock);
kmem_free(dbn, sizeof (*dbn));
VERIFY0(zap_remove_norm(mos, bmark_zapobj, name, mt, tx));
}
static int
dsl_bookmark_destroy_check(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_destroy_arg_t *dbda = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
int rv = 0;
ASSERT(nvlist_empty(dbda->dbda_success));
ASSERT(nvlist_empty(dbda->dbda_errors));
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS))
return (0);
for (nvpair_t *pair = nvlist_next_nvpair(dbda->dbda_bmarks, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbda->dbda_bmarks, pair)) {
const char *fullname = nvpair_name(pair);
dsl_dataset_t *ds;
zfs_bookmark_phys_t bm;
int error;
char *shortname;
error = dsl_bookmark_hold_ds(dp, fullname, &ds,
FTAG, &shortname);
if (error == ENOENT) {
/* ignore it; the bookmark is "already destroyed" */
continue;
}
if (error == 0) {
error = dsl_bookmark_lookup_impl(ds, shortname, &bm);
dsl_dataset_rele(ds, FTAG);
if (error == ESRCH) {
/*
* ignore it; the bookmark is
* "already destroyed"
*/
continue;
}
if (error == 0 && bm.zbm_redaction_obj != 0) {
redaction_list_t *rl = NULL;
error = dsl_redaction_list_hold_obj(tx->tx_pool,
bm.zbm_redaction_obj, FTAG, &rl);
if (error == ENOENT) {
error = 0;
} else if (error == 0 &&
dsl_redaction_list_long_held(rl)) {
error = SET_ERROR(EBUSY);
}
if (rl != NULL) {
dsl_redaction_list_rele(rl, FTAG);
}
}
}
if (error == 0) {
if (dmu_tx_is_syncing(tx)) {
fnvlist_add_boolean(dbda->dbda_success,
fullname);
}
} else {
fnvlist_add_int32(dbda->dbda_errors, fullname, error);
rv = error;
}
}
return (rv);
}
static void
dsl_bookmark_destroy_sync(void *arg, dmu_tx_t *tx)
{
dsl_bookmark_destroy_arg_t *dbda = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
objset_t *mos = dp->dp_meta_objset;
for (nvpair_t *pair = nvlist_next_nvpair(dbda->dbda_success, NULL);
pair != NULL; pair = nvlist_next_nvpair(dbda->dbda_success, pair)) {
dsl_dataset_t *ds;
char *shortname;
uint64_t zap_cnt;
VERIFY0(dsl_bookmark_hold_ds(dp, nvpair_name(pair),
&ds, FTAG, &shortname));
dsl_bookmark_destroy_sync_impl(ds, shortname, tx);
/*
* If all of this dataset's bookmarks have been destroyed,
* free the zap object and decrement the feature's use count.
*/
VERIFY0(zap_count(mos, ds->ds_bookmarks_obj, &zap_cnt));
if (zap_cnt == 0) {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
VERIFY0(zap_destroy(mos, ds->ds_bookmarks_obj, tx));
ds->ds_bookmarks_obj = 0;
spa_feature_decr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
VERIFY0(zap_remove(mos, ds->ds_object,
DS_FIELD_BOOKMARK_NAMES, tx));
}
spa_history_log_internal_ds(ds, "remove bookmark", tx,
"name=%s", shortname);
dsl_dataset_rele(ds, FTAG);
}
}
/*
* The bookmarks must all be in the same pool.
*/
int
dsl_bookmark_destroy(nvlist_t *bmarks, nvlist_t *errors)
{
int rv;
dsl_bookmark_destroy_arg_t dbda;
nvpair_t *pair = nvlist_next_nvpair(bmarks, NULL);
if (pair == NULL)
return (0);
dbda.dbda_bmarks = bmarks;
dbda.dbda_errors = errors;
dbda.dbda_success = fnvlist_alloc();
rv = dsl_sync_task(nvpair_name(pair), dsl_bookmark_destroy_check,
dsl_bookmark_destroy_sync, &dbda, fnvlist_num_pairs(bmarks),
ZFS_SPACE_CHECK_RESERVED);
fnvlist_free(dbda.dbda_success);
return (rv);
}
/* Return B_TRUE if there are any long holds on this dataset. */
boolean_t
dsl_redaction_list_long_held(redaction_list_t *rl)
{
return (!zfs_refcount_is_zero(&rl->rl_longholds));
}
void
dsl_redaction_list_long_hold(dsl_pool_t *dp, redaction_list_t *rl, void *tag)
{
ASSERT(dsl_pool_config_held(dp));
(void) zfs_refcount_add(&rl->rl_longholds, tag);
}
void
dsl_redaction_list_long_rele(redaction_list_t *rl, void *tag)
{
(void) zfs_refcount_remove(&rl->rl_longholds, tag);
}
/* ARGSUSED */
static void
redaction_list_evict_sync(void *rlu)
{
redaction_list_t *rl = rlu;
zfs_refcount_destroy(&rl->rl_longholds);
kmem_free(rl, sizeof (redaction_list_t));
}
void
dsl_redaction_list_rele(redaction_list_t *rl, void *tag)
{
dmu_buf_rele(rl->rl_dbuf, tag);
}
int
dsl_redaction_list_hold_obj(dsl_pool_t *dp, uint64_t rlobj, void *tag,
redaction_list_t **rlp)
{
objset_t *mos = dp->dp_meta_objset;
dmu_buf_t *dbuf;
redaction_list_t *rl;
int err;
ASSERT(dsl_pool_config_held(dp));
err = dmu_bonus_hold(mos, rlobj, tag, &dbuf);
if (err != 0)
return (err);
rl = dmu_buf_get_user(dbuf);
if (rl == NULL) {
redaction_list_t *winner = NULL;
rl = kmem_zalloc(sizeof (redaction_list_t), KM_SLEEP);
rl->rl_dbuf = dbuf;
rl->rl_object = rlobj;
rl->rl_phys = dbuf->db_data;
rl->rl_mos = dp->dp_meta_objset;
zfs_refcount_create(&rl->rl_longholds);
dmu_buf_init_user(&rl->rl_dbu, redaction_list_evict_sync, NULL,
&rl->rl_dbuf);
if ((winner = dmu_buf_set_user_ie(dbuf, &rl->rl_dbu)) != NULL) {
kmem_free(rl, sizeof (*rl));
rl = winner;
}
}
*rlp = rl;
return (0);
}
/*
* Snapshot ds is being destroyed.
*
* Adjust the "freed_before_next" of any bookmarks between this snap
* and the previous snapshot, because their "next snapshot" is changing.
*
* If there are any bookmarks with HAS_FBN at this snapshot, remove
* their HAS_SNAP flag (note: there can be at most one snapshot of
* each filesystem at a given txg), and return B_TRUE. In this case
* the caller can not remove the key in the deadlist at this TXG, because
* the HAS_FBN bookmarks require the key be there.
*
* Returns B_FALSE if there are no bookmarks with HAS_FBN at this
* snapshot's TXG. In this case the caller can remove the key in the
* deadlist at this TXG.
*/
boolean_t
dsl_bookmark_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx)
{
dsl_pool_t *dp = ds->ds_dir->dd_pool;
dsl_dataset_t *head, *next;
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &head));
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dataset_phys(ds)->ds_next_snap_obj, FTAG, &next));
/*
* Find the first bookmark that HAS_FBN at or after the
* previous snapshot.
*/
dsl_bookmark_node_t search = { 0 };
avl_index_t idx;
search.dbn_phys.zbm_creation_txg =
dsl_dataset_phys(ds)->ds_prev_snap_txg;
search.dbn_phys.zbm_flags = ZBM_FLAG_HAS_FBN;
/*
* The empty-string name can't be in the AVL, and it compares
* before any entries with this TXG.
*/
search.dbn_name = "";
VERIFY3P(avl_find(&head->ds_bookmarks, &search, &idx), ==, NULL);
dsl_bookmark_node_t *dbn =
avl_nearest(&head->ds_bookmarks, idx, AVL_AFTER);
/*
* Iterate over all bookmarks that are at or after the previous
* snapshot, and before this (being deleted) snapshot. Adjust
* their FBN based on their new next snapshot.
*/
for (; dbn != NULL && dbn->dbn_phys.zbm_creation_txg <
dsl_dataset_phys(ds)->ds_creation_txg;
dbn = AVL_NEXT(&head->ds_bookmarks, dbn)) {
if (!(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN))
continue;
/*
* Increase our FBN by the amount of space that was live
* (referenced) at the time of this bookmark (i.e.
* birth <= zbm_creation_txg), and killed between this
* (being deleted) snapshot and the next snapshot (i.e.
* on the next snapshot's deadlist). (Space killed before
* this are already on our FBN.)
*/
uint64_t referenced, compressed, uncompressed;
dsl_deadlist_space_range(&next->ds_deadlist,
0, dbn->dbn_phys.zbm_creation_txg,
&referenced, &compressed, &uncompressed);
dbn->dbn_phys.zbm_referenced_freed_before_next_snap +=
referenced;
dbn->dbn_phys.zbm_compressed_freed_before_next_snap +=
compressed;
dbn->dbn_phys.zbm_uncompressed_freed_before_next_snap +=
uncompressed;
VERIFY0(zap_update(dp->dp_meta_objset, head->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
}
dsl_dataset_rele(next, FTAG);
/*
* There may be several bookmarks at this txg (the TXG of the
* snapshot being deleted). We need to clear the SNAPSHOT_EXISTS
* flag on all of them, and return TRUE if there is at least 1
* bookmark here with HAS_FBN (thus preventing the deadlist
* key from being removed).
*/
boolean_t rv = B_FALSE;
for (; dbn != NULL && dbn->dbn_phys.zbm_creation_txg ==
dsl_dataset_phys(ds)->ds_creation_txg;
dbn = AVL_NEXT(&head->ds_bookmarks, dbn)) {
if (!(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)) {
ASSERT(!(dbn->dbn_phys.zbm_flags &
ZBM_FLAG_SNAPSHOT_EXISTS));
continue;
}
ASSERT(dbn->dbn_phys.zbm_flags & ZBM_FLAG_SNAPSHOT_EXISTS);
dbn->dbn_phys.zbm_flags &= ~ZBM_FLAG_SNAPSHOT_EXISTS;
VERIFY0(zap_update(dp->dp_meta_objset, head->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
rv = B_TRUE;
}
dsl_dataset_rele(head, FTAG);
return (rv);
}
/*
* A snapshot is being created of this (head) dataset.
*
* We don't keep keys in the deadlist for the most recent snapshot, or any
* bookmarks at or after it, because there can't be any blocks on the
* deadlist in this range. Now that the most recent snapshot is after
* all bookmarks, we need to add these keys. Note that the caller always
* adds a key at the previous snapshot, so we only add keys for bookmarks
* after that.
*/
void
dsl_bookmark_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx)
{
uint64_t last_key_added = UINT64_MAX;
for (dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg >
dsl_dataset_phys(ds)->ds_prev_snap_txg;
dbn = AVL_PREV(&ds->ds_bookmarks, dbn)) {
uint64_t creation_txg = dbn->dbn_phys.zbm_creation_txg;
ASSERT3U(creation_txg, <=, last_key_added);
/*
* Note, there may be multiple bookmarks at this TXG,
* and we only want to add the key for this TXG once.
* The ds_bookmarks AVL is sorted by TXG, so we will visit
* these bookmarks in sequence.
*/
if ((dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN) &&
creation_txg != last_key_added) {
dsl_deadlist_add_key(&ds->ds_deadlist,
creation_txg, tx);
last_key_added = creation_txg;
}
}
}
/*
* The next snapshot of the origin dataset has changed, due to
* promote or clone swap. If there are any bookmarks at this dataset,
* we need to update their zbm_*_freed_before_next_snap to reflect this.
* The head dataset has the relevant bookmarks in ds_bookmarks.
*/
void
dsl_bookmark_next_changed(dsl_dataset_t *head, dsl_dataset_t *origin,
dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
/*
* Find the first bookmark that HAS_FBN at the origin snapshot.
*/
dsl_bookmark_node_t search = { 0 };
avl_index_t idx;
search.dbn_phys.zbm_creation_txg =
dsl_dataset_phys(origin)->ds_creation_txg;
search.dbn_phys.zbm_flags = ZBM_FLAG_HAS_FBN;
/*
* The empty-string name can't be in the AVL, and it compares
* before any entries with this TXG.
*/
search.dbn_name = "";
VERIFY3P(avl_find(&head->ds_bookmarks, &search, &idx), ==, NULL);
dsl_bookmark_node_t *dbn =
avl_nearest(&head->ds_bookmarks, idx, AVL_AFTER);
/*
* Iterate over all bookmarks that are at the origin txg.
* Adjust their FBN based on their new next snapshot.
*/
for (; dbn != NULL && dbn->dbn_phys.zbm_creation_txg ==
dsl_dataset_phys(origin)->ds_creation_txg &&
(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN);
dbn = AVL_NEXT(&head->ds_bookmarks, dbn)) {
/*
* Bookmark is at the origin, therefore its
* "next dataset" is changing, so we need
* to reset its FBN by recomputing it in
* dsl_bookmark_set_phys().
*/
ASSERT3U(dbn->dbn_phys.zbm_guid, ==,
dsl_dataset_phys(origin)->ds_guid);
ASSERT3U(dbn->dbn_phys.zbm_referenced_bytes_refd, ==,
dsl_dataset_phys(origin)->ds_referenced_bytes);
ASSERT(dbn->dbn_phys.zbm_flags &
ZBM_FLAG_SNAPSHOT_EXISTS);
/*
* Save and restore the zbm_redaction_obj, which
* is zeroed by dsl_bookmark_set_phys().
*/
uint64_t redaction_obj =
dbn->dbn_phys.zbm_redaction_obj;
dsl_bookmark_set_phys(&dbn->dbn_phys, origin);
dbn->dbn_phys.zbm_redaction_obj = redaction_obj;
VERIFY0(zap_update(dp->dp_meta_objset, head->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
}
}
/*
* This block is no longer referenced by this (head) dataset.
*
* Adjust the FBN of any bookmarks that reference this block, whose "next"
* is the head dataset.
*/
/* ARGSUSED */
void
dsl_bookmark_block_killed(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
{
/*
* Iterate over bookmarks whose "next" is the head dataset.
*/
for (dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg >=
dsl_dataset_phys(ds)->ds_prev_snap_txg;
dbn = AVL_PREV(&ds->ds_bookmarks, dbn)) {
/*
* If the block was live (referenced) at the time of this
* bookmark, add its space to the bookmark's FBN.
*/
if (bp->blk_birth <= dbn->dbn_phys.zbm_creation_txg &&
(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)) {
mutex_enter(&dbn->dbn_lock);
dbn->dbn_phys.zbm_referenced_freed_before_next_snap +=
bp_get_dsize_sync(dsl_dataset_get_spa(ds), bp);
dbn->dbn_phys.zbm_compressed_freed_before_next_snap +=
BP_GET_PSIZE(bp);
dbn->dbn_phys.zbm_uncompressed_freed_before_next_snap +=
BP_GET_UCSIZE(bp);
/*
* Changing the ZAP object here would be too
* expensive. Also, we may be called from the zio
* interrupt thread, which can't block on i/o.
* Therefore, we mark this bookmark as dirty and
* modify the ZAP once per txg, in
* dsl_bookmark_sync_done().
*/
dbn->dbn_dirty = B_TRUE;
mutex_exit(&dbn->dbn_lock);
}
}
}
void
dsl_bookmark_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
if (dsl_dataset_is_snapshot(ds))
return;
/*
* We only dirty bookmarks that are at or after the most recent
* snapshot. We can't create snapshots between
* dsl_bookmark_block_killed() and dsl_bookmark_sync_done(), so we
* don't need to look at any bookmarks before ds_prev_snap_txg.
*/
for (dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
dbn != NULL && dbn->dbn_phys.zbm_creation_txg >=
dsl_dataset_phys(ds)->ds_prev_snap_txg;
dbn = AVL_PREV(&ds->ds_bookmarks, dbn)) {
if (dbn->dbn_dirty) {
/*
* We only dirty nodes with HAS_FBN, therefore
* we can always use the current bookmark struct size.
*/
ASSERT(dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN);
VERIFY0(zap_update(dp->dp_meta_objset,
ds->ds_bookmarks_obj,
dbn->dbn_name, sizeof (uint64_t),
sizeof (zfs_bookmark_phys_t) / sizeof (uint64_t),
&dbn->dbn_phys, tx));
dbn->dbn_dirty = B_FALSE;
}
}
#ifdef ZFS_DEBUG
for (dsl_bookmark_node_t *dbn = avl_first(&ds->ds_bookmarks);
dbn != NULL; dbn = AVL_NEXT(&ds->ds_bookmarks, dbn)) {
ASSERT(!dbn->dbn_dirty);
}
#endif
}
/*
* Return the TXG of the most recent bookmark (or 0 if there are no bookmarks).
*/
uint64_t
dsl_bookmark_latest_txg(dsl_dataset_t *ds)
{
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
dsl_bookmark_node_t *dbn = avl_last(&ds->ds_bookmarks);
if (dbn == NULL)
return (0);
return (dbn->dbn_phys.zbm_creation_txg);
}
static inline unsigned int
redact_block_buf_num_entries(unsigned int size)
{
return (size / sizeof (redact_block_phys_t));
}
/*
* This function calculates the offset of the last entry in the array of
* redact_block_phys_t. If we're reading the redaction list into buffers of
* size bufsize, then for all but the last buffer, the last valid entry in the
* array will be the last entry in the array. However, for the last buffer, any
* amount of it may be filled. Thus, we check to see if we're looking at the
* last buffer in the redaction list, and if so, we return the total number of
* entries modulo the number of entries per buffer. Otherwise, we return the
* number of entries per buffer minus one.
*/
static inline unsigned int
last_entry(redaction_list_t *rl, unsigned int bufsize, uint64_t bufid)
{
if (bufid == (rl->rl_phys->rlp_num_entries - 1) /
redact_block_buf_num_entries(bufsize)) {
return ((rl->rl_phys->rlp_num_entries - 1) %
redact_block_buf_num_entries(bufsize));
}
return (redact_block_buf_num_entries(bufsize) - 1);
}
/*
* Compare the redact_block_phys_t to the bookmark. If the last block in the
* redact_block_phys_t is before the bookmark, return -1. If the first block in
* the redact_block_phys_t is after the bookmark, return 1. Otherwise, the
* bookmark is inside the range of the redact_block_phys_t, and we return 0.
*/
static int
redact_block_zb_compare(redact_block_phys_t *first,
zbookmark_phys_t *second)
{
/*
* If the block_phys is for a previous object, or the last block in the
* block_phys is strictly before the block in the bookmark, the
* block_phys is earlier.
*/
if (first->rbp_object < second->zb_object ||
(first->rbp_object == second->zb_object &&
first->rbp_blkid + (redact_block_get_count(first) - 1) <
second->zb_blkid)) {
return (-1);
}
/*
* If the bookmark is for a previous object, or the block in the
* bookmark is strictly before the first block in the block_phys, the
* bookmark is earlier.
*/
if (first->rbp_object > second->zb_object ||
(first->rbp_object == second->zb_object &&
first->rbp_blkid > second->zb_blkid)) {
return (1);
}
return (0);
}
/*
* Traverse the redaction list in the provided object, and call the callback for
* each entry we find. Don't call the callback for any records before resume.
*/
int
dsl_redaction_list_traverse(redaction_list_t *rl, zbookmark_phys_t *resume,
rl_traverse_callback_t cb, void *arg)
{
objset_t *mos = rl->rl_mos;
redact_block_phys_t *buf;
unsigned int bufsize = SPA_OLD_MAXBLOCKSIZE;
int err = 0;
if (rl->rl_phys->rlp_last_object != UINT64_MAX ||
rl->rl_phys->rlp_last_blkid != UINT64_MAX) {
/*
* When we finish a send, we update the last object and offset
* to UINT64_MAX. If a send fails partway through, the last
* object and offset will have some other value, indicating how
* far the send got. The redaction list must be complete before
* it can be traversed, so return EINVAL if the last object and
* blkid are not set to UINT64_MAX.
*/
return (SET_ERROR(EINVAL));
}
/*
* Binary search for the point to resume from. The goal is to minimize
* the number of disk reads we have to perform.
*/
buf = zio_data_buf_alloc(bufsize);
uint64_t maxbufid = (rl->rl_phys->rlp_num_entries - 1) /
redact_block_buf_num_entries(bufsize);
uint64_t minbufid = 0;
while (resume != NULL && maxbufid - minbufid >= 1) {
ASSERT3U(maxbufid, >, minbufid);
uint64_t midbufid = minbufid + ((maxbufid - minbufid) / 2);
err = dmu_read(mos, rl->rl_object, midbufid * bufsize, bufsize,
buf, DMU_READ_NO_PREFETCH);
if (err != 0)
break;
int cmp0 = redact_block_zb_compare(&buf[0], resume);
int cmpn = redact_block_zb_compare(
&buf[last_entry(rl, bufsize, maxbufid)], resume);
/*
* If the first block is before or equal to the resume point,
* and the last one is equal or after, then the resume point is
* in this buf, and we should start here.
*/
if (cmp0 <= 0 && cmpn >= 0)
break;
if (cmp0 > 0)
maxbufid = midbufid - 1;
else if (cmpn < 0)
minbufid = midbufid + 1;
else
panic("No progress in binary search for resume point");
}
for (uint64_t curidx = minbufid * redact_block_buf_num_entries(bufsize);
err == 0 && curidx < rl->rl_phys->rlp_num_entries;
curidx++) {
/*
* We read in the redaction list one block at a time. Once we
* finish with all the entries in a given block, we read in a
* new one. The predictive prefetcher will take care of any
* prefetching, and this code shouldn't be the bottleneck, so we
* don't need to do manual prefetching.
*/
if (curidx % redact_block_buf_num_entries(bufsize) == 0) {
err = dmu_read(mos, rl->rl_object, curidx *
sizeof (*buf), bufsize, buf,
DMU_READ_PREFETCH);
if (err != 0)
break;
}
redact_block_phys_t *rb = &buf[curidx %
redact_block_buf_num_entries(bufsize)];
/*
* If resume is non-null, we should either not send the data, or
* null out resume so we don't have to keep doing these
* comparisons.
*/
if (resume != NULL) {
if (redact_block_zb_compare(rb, resume) < 0) {
continue;
} else {
/*
* If the place to resume is in the middle of
* the range described by this
* redact_block_phys, then modify the
* redact_block_phys in memory so we generate
* the right records.
*/
if (resume->zb_object == rb->rbp_object &&
resume->zb_blkid > rb->rbp_blkid) {
uint64_t diff = resume->zb_blkid -
rb->rbp_blkid;
rb->rbp_blkid = resume->zb_blkid;
redact_block_set_count(rb,
redact_block_get_count(rb) - diff);
}
resume = NULL;
}
}
if (cb(rb, arg) != 0)
break;
}
zio_data_buf_free(buf, bufsize);
return (err);
}
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